1988 Power Seat Wiring Diagram

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My driver's seat adjusts to every position except forward. I need this for a safety certificate. I exchanged it for the passenger seat mount but it didn't work either. I've taken the door switch apart twice and see no problems there. I suspect a wire has broken between the door switch and the seat, likely at the door hinge. If I had a wiring diagram I could test each wire for continuity. The Haynes repair manual doesn't cover this. Does anyone have wiring diagrams or suggestions?